Warp stop motion for looms



June 24, 1930. G. H. SHUTT 1,766,804

WARP STOP MOTION FOR LOOMS Filed May 25, 1927 2 Sheets-Sheet l firm/far 62 4596 h. Six/Z2 June 24, 1930. G. H. SHUTT ,7

WARP STOP MOTION FOR LOOMS Filed May 25, 1927 2 Sheets-Sheet 2 1a 16 J9 41 21 a0 41 Patented June 24, 1930 UNITED STATES PATENT OFFICE GEORGE E. SHUTT, OF NEW IBEDFORD, MASSACHUSETTS, ASSIGN OR TO CROMPTON &

KNOWLES LOOM WORKS, OF WORCESTER, MASSACHUSETTS, A CORPORATION OF,

MASSACHUSETTS WARP. STOP MOTION FOR LO OMS :Application filed. May 25,

This invention relates to improvements in warp stop motions and it is the general object of the invention to providemeans whereby such a motion may be readily adaptable to varying conditions of Warp in a loom.

In warp stop motions of the type set forth in Patent No. 1,265,112 issued to Regan there is generally employed a non-circular oscillating rod which extends through slots formed in the upper ends of the drop wires. The tops of these slots are restricted so that when a drop wire falls due to a fault of the warp the rod is held against oscillation to stop the loom. With a warp stop motion of this type it is desirable that the distance between-the oscillating detector rod and the restricted part of the drop wire slot be as small as possible. The reason for this is that if the warp thread should break at a point distant from the warp stop motion and the broken end be supported by neighboring warp threads an interval of time will lapse before the drop wire will be lowered into operative position with respect to the detector rod. Obviously, the greater the distance betweenthe narrow partof the slot and the detector rod the greater the length of time requiredfor the drop wire to fall onto the rod. On the other hand, the top of the slot should be sufiiciently above the detector rod so that a small amount of temporary slackness due to uneven lettingofi can occur in the warp without bringing the narrow part of the slot in stopping relation with respect to the rod.

When weaving three or four thread georgette it is found that the broken warp thread is sufficiently stifi to support alight drop wire for such a length of timeas will spoil the fabric being woven andit is therefore desirable to have the distance between the restricted part ofthe slot and the detector rods as small as possible. It so happens that the conditions under which georgette is woven regarding shedding, and the drawing. of the warp ends and the number of harnesses used make it possible'to have the drop wires in a relatively low position such as is necessary to secure the short distance between the drop wire and the'narrow part of the slot.

On the other hand, certain other fabrics 1927. Serial No. 194,173.

thread Georgette warp. It is found that the weaving bonditions of satin with regard to the draw of the Warp and the number of harness frames used make, it necessary to have less space between the separator bars and the detector rods. This means that the drop wires should be relativelyhigher than with georgette butinasmuch as the filling is light-' er the-same dropwire will fall into stopping position as soon as though it were used on a Georgette warp with the wire inrelatively lower position. Itis an important object of my invention to provide means for varying the position of the drop wire with respect to the detector rods so as to meet the conditions mentioned in connection with differentkinds of fabric such as georgetteand satin.

It is "found that when a large number of harness 'fram'esare used thewar'p threads eX- tending either from the whiproll'or the warp beam forwardly to the harness frames is spread out in the form'ofa fan in a vertical planeso that the drop wires in the front bank are'higher than "those-in the rear bank with the result in certain instances that the bottom ofithe slot in the top of the drop wires of the front banlrstrike 'thebottom of the associated detector rod and prevent thesame frommoving upwardly as faras wouldbenecessaryto allow the warp threads to lie-ina straight line. The result of this i is .to cut the warp threads which.v are pushed up againstithe .drop wires and itis a further object of my invention to compensate .for the spread of the warp threads due to a large number of \harness frames so that'the' proper relation will exist between the drop wires and the'detector rods.

Some fancy fabrics are woven from two beams, the principal beam supplying the body of'the warp and the additional beam or beams supplying warp for decorative effects. These additional warps are not infrequently under less tension than are the warps ffor the main body of the fabric. The warp stop motion, however, can make no distinction between the respective warp threads and must therefore be set to accommodate the slack threads. If the loom be set to weave a fabric having no slack threads the separator bars and hence the drop wires will be in lowest position for the reasons already given. If the character of fabric being woven be changed so as to require certain of the warp threats to be slack it is found that the drop wires supported by said slack threads would be too low with resultant unnecessary stopping of the loom due to the fact that there is insufiicient distance between the oscillating detector rods and the restricted part of the slot'in the drop wire. Under these conditions it is necessary to provide some means for raising all of the warp threads in order that the drop wires on the slack threads may be properly placed with respect to the detector rods. It is a still further object of my invention to provide for such adjustment as will permit the same stop motion to weave fabrics all the warp threads of which are normally taut and also fabrics wherein certain of the warp threads may be relatively slack.

'f lVhen warp stop motions are applied to relatively wide looms it is desirable to hold the centers of the separating bars and detector rods in proper alignment and to accomplish this result there is usually employed a socalled separator. It is a further object of my invention to provide an improved form of separator made with adjustable parts which will permit the distance between the separator bars and the detector rods to be changed as. the character of fabric being woven is changed.

l/Vith these and other objects in view which will appear as the description proceeds, my invention resides in the combination and arrangement of parts hereinafter described and'set forth in the claims.

In the accompanying drawings wherein I have shown one embodiment of my invention,

Fig. 1 is a vertical section taken through the loom and showing my invention applied thereto,

Fig. 2 is an enlarged rear elevation taken in the direction of arrow 2, Fig. 1, certain parts being shown in section and other parts being broken away for the sake of clearness,

Fig. 8 is a vertical section on line 3 3 of Fig. 2 showing the separator bars in relatively low position for the weaving of a fabric such as georgette, or one with tight warp,

Fig. 4.- is a View similar to Fig. 3 but with the separatorbars raised to the position they should occupy when such a fabric as satin is being woven, or when the warp has slack threads,

Fig. 5 is a vertical section on line 55 of Fig. 2 showing the separator,

Fig. 6 is a detailed top plan view taken in the direction of arrow 6, Fig. 2, and,

Fig. 7 is a detailed top'plan view taken in the direction of arrow 7, Fig. 2.

Referring more particularly to Figs. 1 and 2 I have shown a loom frame 10 having a bottom shaft 11 to which is secured a cam 12 which may receive a complete rotation every second pick of the loom. A cam lever 13 pivoted at 14; to the frame cooperates with the cam to give upright rod 15 a vertical reciprocation once every-two picks of the loom. Said rod' is connected at the upper end thereof with a lever 16 pivoted as at 17 to a warp stop motion head 18 of the form illustrated in patent to Holmes No. 1,360,638. By means of themechanism set forth in the said patent detector rods 19 which are noncircular in cross section are given an oscillatii'ig movement at periodic intervals. The drop wires 20 employed are as shown in the aforesaid patents, said drop wires being shown more clearly herein in Figs. 3 and at as having a slot in the upper end thereof the top of which is restricted as at 21 and the lower portion of which is relatively wide as indicated at 22. An open slot 23 at the bottom of each drop wire provides means for supporting the same on its respective warp thread.

The knock-ofi mechanism comprises a rod 24 connected to the head 18 as set forth in said Holmes patent and the forward end of said rod is attached to shipper mechanism indicatedgenerally at 25. Under normal operation the rod 15 will receive a periodic vertical reciprocation the effect of which will be to oscillate the non-circular detector rods 19. So long as the drop wires are all in raised position the detector rods are free to rock on their axes and the shipper mechanism remains in running position, but when one of the drop wires falls the corresponding detector rodwill be held against oscillation by the restricted portion 21 of the slot of the fallen drop wire and the rod 24 will be given a forward movement to rock the shipper handle to loom stopping position. This mechanism is well understood and is thought to be sufliciently described in the aforesaid Regan and Holmes patents so that further description herein is unnecessary. The matter thus far described does not enter into my present invention and may be of the usual form.

In carrying my present invention into effeet I provide improved means for varying the distance between the drop wires and the detector rods and this I accomplish by providing movable supports for the separator bars to the end that the latter may be given a plurality of vertical positions. The warp of a loom ordinarily lies above and is positioned by the separator bars and of course the drop wires being supported by the warp are indirectly positioned by the separator bars. Accordingly, stands are secured to the loom frame and have longitudinally adjustably secured thereto L-shaped supporting angle arms 31 each having a portion 32 which extends through and is secured to a hub 33. As shown in Fig. 2 the hub on the left hand side is a part of the head 18 whereas the hub on the right is part of a secondary head 18". In this way each head of the warp stop motion is held in fixed position with respect to the loom. It is to be understood that the detector rods 19 oscillate about centers which are fixed with respect to the heads 18 and 18 and consequently the angle arm supports 31.

Each head has projecting inwardly there from a pair of lugs each of which is perforated to receive a threaded rod 41. The lower end of each rod is secured to a separator bar support 42 and each threaded rod is provided with adjusting nuts 43 above and below the corresponding lugs 40. Each bar support is provided with a plurality of slots 44 which receive the ends of the separator bars 45. Said bars are held in spaced relation and position the lower ends of the drop wires. The warp W passes forwardly from the whip roll R and is led over the separator bars 45 so that the latter as shown in Figs. 3 and 4 indirectly determine the vertical position of the drop wires. of the separator bars may be narrower than others but I consider itdesirable to have the outside bars as wide as any of the others and the bars ofsmaller dimension will ordinarily be located between said outside bars. It is not necessary to employ this construction but it has been found convenient in practice. 7

The so-called separator shown at and set forth more particularly in Figs. 2, 5 and 7 comprises a body portion 51 provided at the lower side thereof with a plurality of slots 52 which receive the aforesaid separator bars 45. A depending ear 53 has pivoted thereto a bottom cap 54 the right hand end of which as viewed in Fig. 5 is forked as at 55, see more particularly Fig. 2. Said forked end receives a screw 56 pivoted as at 57 to the body portion 51 and a wingednut 58 provides means for detachably securing the bottom cap in proper position with the separators held against the bars.

The body portion has a pair of upstanding horns 59 which are received by sockets 60 formed on the ends of the detector rod guide 61, said guide being provided with a plurality of upwardly opening slots 62 which are larger than the detector rods but sufficiently small to hold the latter against undue lateral displacement. By means of set screws 63 carried by the guide 61 the latter may be held in adjusted vertical position on the horns 59.

It is sufficient for my present purpose to pro- If desired, certain vide means for varying the location ofthe guidefil with respect to the body. portion 51 and I do not wish to be limited necessarily to the particular means shown herein for securing this adjustment.

As previously stated it is desirable to change the relation between the detector rods 19 and the restricted part 21 of the drop wires 20. As shown in Fig. 4 the motion is set for warp conditions such as attend the weaving of satin or where a few slack warp threads are used. To meet these conditions the separator bar supports 42 will be raised and held in relatively high position by the nuts 43 and the threaded rods 41. The result of this adjustment is to keep the narrow slot portions 21 the proper distance above the detector rods 19. r

If at a later time the same loom to which the warp stop motion is applied is to be employed for vweavinggeorgette or a fabric requiring all the warp threads to be tight the parts will be moved to the relative position shown in Fig. 3; If this were not done and the parts remained as shown in Fig. 4 the tightening of the warp would raise the drop wires so that the distance between the narrow part of the slot 21 and the detector rods 19 would be greater than is desirable and a break in the warp occurring several inches from the warp stop motion might require too much time for the corresponding drop wire to fall into stopping engagement with the associated detector rod, The supports 42 are therefore lowered to compensate for the relatively higher position of the drop wires due to the tighter warp and inthis way operative relation is maintained between the drop Wires and the detector rods. Corresponding changes can be made in the separatorto accommodate the relative positions of thedetector rods and the separator bars.

From the foregoing it will be seen that I have provided means for maintaining the proper relation between the drop wires and the detector rods and that it is possible by the use of my present invention to maintain the narrow parts 21 of the drop wire slots at the proper minimum distance above the detector rods irrespective of the character of cloth being woven. It will further be seen that I have provideda separator of an improved form such as is set forth in Figs. 5 and 7 which can be varied to meet the conditions brought about by the adjustment of the separator bars with respect to the detector rods. It is to be understood that I do not wish to be limited to the particular construcscope of the invention and I do not wish to be limited to the details herein disclosed, but what I claim is:

1. In a warp stop motion having drop wires, detector rods to cooperate with fallen drop wires, separator bars located normally below the detector rods, a frame to hold the detector rods, a support for the separator bars, a threaded rod extending upwardly from each end of the separator bar support and having operative engagement with the frame, and means to hold each bar with respect to the frame, each threaded rod capable of adjusting the corresponding end of the support relatively to the frame while the other end of the support remains stationary with the frame.

2. In a warp stop motion having drop wires, detector rods to cooperate with fallen drop Wires, separator bars located normally below the detector rods, a frame to hold the detector rods, a support for the separator bars, a threaded rod extending upwardly from each end of the support and through the frame, a nut on the upperend of each threaded rod whereby each threaded rod may be moved with respect to the frame independently of the other rod.

3. In a warp stop motion having drop wires, detector rods to cooperate with fallen drop wires, separator bars located normally below the detector rods, a frame to hold the detector rods, a support for the separator bars, a threaded rod extending upwardly from each end of the support and through the frame, a nut on the upper end of each threaded rod whereby each threaded rod may be moved with respect to the frame independently of the other rod, and a second nut on each rod to engage the frame and prevent upward movement of the corresponding threaded rod.

In testimony whereof I have hereunto affixed my signature.

GEORGE E. SHUTT. 

